Hello,Thanks for posting your query. Cortical thinning on ultrasound scan of kidney is suggestive of a renal parenchymal malfunctioning. Raised levels of BUN and creatinine in serum are further confirmatory of same.Long term diabetes and hypertension can lead to such parenchymal changes in the kidney. Controlling the predisposing factors will be helpful.I hope this answers your query. In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.Please accept my answer in case you do not have further queries.Wishing you good health.Regards.Dr. Praveen Tayal.